| 摘要 |
PROBLEM TO BE SOLVED: To provide a screened venting structure of an opening section being simply cleaned. SOLUTION: The screened venting structure has a frame body 5, a first rod group (2) composed of a plurality of rods 2 supported in parallel in the frame body 5 at predetermined intervals and a second rod group (3) consisting of a plurality of rods 3 supported in parallel with each rod 2 constituting the first rod group (2) at predetermined intervals in the frame body 5. In the rods 2 of the first rod group and the rods 3 of the second rod group, each is supported rotatably around central axes while being arranged so as to shield normal sight lines mutually passing in openings under working conditions. COPYRIGHT: (C)2004,JPO
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